missing or broken reference

I've recently converted a database created with Access97 to Access2002 version.
The problem is when I open up one of the forms I created before, a window pops up saying:

"Your Microsoft Access database or project contains a missing or broken reference to the file 'PRO' version 1.0"

I followed the tips in [Help], go to Tools, then References, and clear check boxes next to any missing reference. But I don't see anything named "PRO version 1.0" in the Available References box.

Would anyone have any idea what the file 'PRO version 1.0" is and why it isn't in the Available References box?

Any comment appreciated. Cheers

Hello,

If you can't find any missing library under TOOL - REFRENCES window, then
most likely "PRO version" is embadded on the form or
there's code behind either onOpen or Onload event that's referencing to
this library.

If you can't find the code or it's not embadded to the form and just create
a new form and then copy the code (assuming there's code
behind the old form) back to this new form.

Hope this helps!

Ki